The Sending of Eight: Bel-Shamharoth

We get a foretelling plot of The Sending of Eight on pg 82. Twoflower and Rincewind have become separated. Twoflower has sat on a stone to think about what he should do. Then he gets up and looks at the stome:

The stone really was uncomfortable. Twoflower looked down and, for the first time, noticed the strange carving.

It looked like a spider. Or wa it a squid. Moss and lichen rather blurred the precise details. But they didn't blur the runes carved below it. Twoflower could read them clearly, and they said: Traveller, the hospitable temple of Bel-Shamharoth lies one thousand paces hubwards.

Now this was strange, Twoflower realized, because although he could read the message the actual letters were completely unknown to him. Somehow the message was arriving in his brain without the tedious necessity of passing through his eyes.

Does the name Bel-Shamharoth sound familiar? The description of a creature that is part spider and part squid?

Recognize Yog-Sothoth - a creature from H.P. Lovecraft's Cthulu stories?

Yes, Pratchett will be giving an homage to HP Lovecraft in this story.